Flip-flop state extraction out of reaback stream in Virtex-II/Pro

Hi,
I am dealing with reconfigurable computing and relocating modules
within a Virtex-II FPGA. In order to save and restore the current
flip-flop states I need to determine where to find the states in a
readback stream. All necessary equations were provided in xapp151, but
only for the Virtex not the Virtex-II FPGAs. Given the row and column,
as well as the slice and FF, I would like to know the frame and the
offset within the frame where to find the flip flop state.
Is there anyone who can help.
Regards
Heiko

Hi Heiko,

heiko@csse.uwa.edu.au wrote:

> I am dealing with reconfigurable computing and relocating modules
> within a Virtex-II FPGA. In order to save and restore the current
> flip-flop states I need to determine where to find the states in a
> readback stream. All necessary equations were provided in xapp151, but
> only for the Virtex not the Virtex-II FPGAs. Given the row and column,
> as well as the slice and FF, I would like to know the frame and the
> offset within the frame where to find the flip flop state.

The "-l" option to bitgen will give you an ASCII Logic Allocation file,
that gives you these sort of details.

> Is there anyone who can help.

Maybe try the partial-config mailing list. Lots of expertise there.  Be
warned - partial reconfiguration is a cruel mistress!

http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux/Mailing_List/index.html

Cheers,

John

Hi John,
thanks for you advice. Actually, I knew the -l option and I worked with
that for months, but I could not remember that the frame address and
offset is in there as well. Do you also have an idea in which frame at
which offset to put the a new value for each flip flop, so that after
downloading the manipulated bitstream to the FPGA and asserting reset,
you have restored a previous state. I will try to mail to the other
mailing list as well.
Heiko

Are there any equations, how to calculate the frame address and the
frame offset out of the X, Y etc. position of the flip-flops or do I
have to re-engineer them out of the ll file?
Heiko